<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        *{
            margin: 0px;
            padding: 0px;
        }
        header{
            height: 100px;
            background-color: gold;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
        }
        footer{
            height: 100px;
            background-color: pink;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
        }
        .content{
            background-color: blue;
            position: fixed;
            top: 100px;
            bottom: 100px;
            left: 0;
            right: 0;
        }
        .content .left{
            width: 300px;
            height: 100%;
            background-color: red;
            position: fixed;
            top: 100px;
            bottom: 100px;
            left: 0;
        }
        .content .right{
            background-color: skyblue;
            position: fixed;
            left: 300px;
            right: 0px;
            bottom: 100px;
            top: 100px;
        }
    </style>
</head>
<body>
    <header>Header</header>
    <div class="content">
        <div class="left">Left</div>
        <div class="right">Right</div>
    </div>
    <footer>Footer</footer>
</body>
</html>